首页|Microplastics enhance the adsorption capacity of zinc oxide nanoparticles:Interactive mechanisms and influence factors
Microplastics enhance the adsorption capacity of zinc oxide nanoparticles:Interactive mechanisms and influence factors
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Microplastics enhance the adsorption capacity of zinc oxide nanoparticles:Interactive mechanisms and influence factors
Microplastics(MPs)are of particular concern due to their ubiquitous occurrence and propen-sity to interact and concentrate various waterborne contaminants from aqueous surround-ings.Studies on the interaction and joint toxicity of MPs on engineered nanoparticles(ENPs)are exhaustive,but limited research on the effect of MPs on the properties of ENPs in multi-solute systems.Here,the effect of MPs on adsorption ability of ENPs to antibiotics was in-vestigated for the first time.The results demonstrated that MPs enhanced the adsorption affinity of ENPs to antibiotics and MPs before and after aging showed different effects on ENPs.Aged polyamide prevented aggregation of ZnONPs by introducing negative charges,whereas virgin polyamide affected ZnONPs with the help of electrostatic attraction.FT-IR and XPS analyses were used to probe the physicochemical interactions between ENPs and MPs.The results showed no chemical interaction and electrostatic interaction was the dom-inant force between them.Furthermore,the adsorption rate of antibiotics positively corre-lated with pH and humic acid but exhibited a negative correlation with ionic strength.Our study highlights that ENPs are highly capable of accumulating and transporting antibiotics in the presence of MPs,which could result in a widespread distribution of antibiotics and an expansion of their environmental risks and toxic effects on biota.It also improves our understanding of the mutual interaction of various co-existing contaminants in aqueous environments.
College of Environmental Science and Engineering,Hunan University and Key Laboratory of Environmental Biology and Pollution Control(Hunan University),Ministry of Education,Changsha 410082,China
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